Ice caves sparkle along Lake Superior's sandstone cliffs (photos)

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HTR Media photojournalist Sue Pischke recently traveled to Bayfield in northern Wisconsin to photograph the spectacular ice caves. This rare natural wonder was accessible on foot after the waters of Lake Superior froze over its south shore for the first time in five years - thanks to Mother Nature and the frigid weather this winter.

The ice caves grace the red sandstone cliffs along the Lake Superior shoreline at the Mainland Unit of Apostle Islands National Lakeshore. Pillars of ice formations and large icicles extend down from the top of the cliffs where waterfalls have frozen in place. Frozen waves encrust the base of the cliffs and feathered icicles called hoarfrost create a spectacle inside the ice-covered caves.